MSDN
public partial class Form1 : Form
{
Bitmap DrawArea;
public Form1()
{
InitializeComponent();
DrawArea = new Bitmap(pictureBox1.Size.Width, pictureBox1.Size.Height);
pictureBox1.Image = DrawArea;
}
private void Form1_Load(object sender, EventArgs e)
{
Graphics g;
g = Graphics.FromImage(DrawArea);
Pen mypen = new Pen(Brushes.Black);
g.DrawLine(mypen, 0, 0, 200, 200);
g.Clear(Color.White);
g.Dispose();
}
private void Button1_Click(object sender, EventArgs e)
{
Graphics g;
g = Graphics.FromImage(DrawArea);
Pen mypen = new Pen(Color.Black);
g.DrawLine(mypen, 0,0,200,150);
pictureBox1.Image = DrawArea;
g.Dispose();
}
private void pictureBox1_Paint(object sender, PaintEventArgs e) { int picBoxWidth = pictureBox1.Size.Width; int picBoxHeight = pictureBox1.Size.Height; int halfWidth = pictureBox1.Size.Width / 2; int halfHeight = pictureBox1.Size.Height / 2; Graphics objGraphic = e.Graphics; //**請注意這一行** Pen pen = new Pen(Color.Black); int b = 2; int m = 2; for (int x = 0; x < 426; x++) { int y = m * x + b; x = (y - b) / m; objGraphic.DrawLine(pen, x, y, -x, -y); System.Drawing.Drawing2D.GraphicsState graph = objGraphic.Save(); objGraphic.Restore(graph); } objGraphic.DrawLine(pen, 0, halfHeight, picBoxWidth, halfHeight); objGraphic.DrawLine(pen, halfWidth, 0, halfWidth, picBoxHeight); objGraphic.DrawLine(pen, 20, 20, 300, 300); }
from:http://trufflepenne.blogspot.tw/2010/11/cpicturebox.html
